diff --git a/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs b/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
index 9d6848b..8508deb 100644
--- a/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
+++ b/YD_AllHeartRates.Api/Services/Impl/DeviceService.cs
@@ -51,7 +51,7 @@ namespace YD_AllHeartRates.Api.Services.Impl
                         from s in ds.DefaultIfEmpty()
                         select new DevicePageListDto
                         {
-                            Id = s.Id,
+                            Id = d.Id,
                             Code = d.Code,
                             DeviceType = d.DeviceType,
                             StudentNo = d.StudentNo,